WO2014077517A1 - 고흡수성 수지 - Google Patents
고흡수성 수지 Download PDFInfo
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- WO2014077517A1 WO2014077517A1 PCT/KR2013/009162 KR2013009162W WO2014077517A1 WO 2014077517 A1 WO2014077517 A1 WO 2014077517A1 KR 2013009162 W KR2013009162 W KR 2013009162W WO 2014077517 A1 WO2014077517 A1 WO 2014077517A1
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
- B01J20/267—Cross-linked polymers
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28004—Sorbent size or size distribution, e.g. particle size
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F22/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/68—Superabsorbents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/285—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
- C08F220/286—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2371/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
- C08J2371/02—Polyalkylene oxides
Definitions
- the present invention relates to a super absorbent polymer.
- Super Absorbent Polymer is a synthetic polymer material that has the ability to absorb about 500 to 1000 times its own weight. Each developer has a super absorbent material (SAM) and an absorbent gel (AGM). They are named differently. Such superabsorbent polymers have been put into practical use as a sanitary appliance, and are currently used in gardening soil repair agents, in addition to sanitary products such as children's paper diapers . It is widely used in various materials such as civil engineering materials, seedling sheets, and freshness retainers in food distribution.
- a method for producing such a super absorbent polymer a method by reverse phase suspension polymerization or a method by aqueous solution polymerization is known.
- a method of aqueous solution polymerization a thermal polymerization method for polymerizing while breaking the hydrogel polymer in a kneader having several shafts, and a photopolymerization method for simultaneously performing polymerization and drying by irradiating ultraviolet rays or the like on a belt with a high concentration of aqueous solution Etc. are known.
- the present invention is to provide a super absorbent polymer exhibiting more improved absorption rate and absorbency.
- a superabsorbent polymer comprising (meth) acrylic polyalkylene glycol present on the crosslinked polymer.
- the surface crosslinked layer by crosslinking is formed on the surface of the crosslinked polymer, and the (meth) acrylated polyalkylene glycol may be present on the crosslinked polymer in the surface crosslinked layer.
- At least a part of the (meth) acrylated polyalkylene glycol may be crosslinked with the crosslinked polymer or the surface crosslinked layer.
- the (meth) acrylated polyalkylene glycol has a weight average molecular weight
- the (meth) acrylated polyalkylene glycol may be at least one selected from the group consisting of (meth) acrylated polyethylene glycol, (meth) acrylated polypropylene glycol and (meth) acrylated polybutylene glycol.
- the acrylic acid monomer may be represented by the following formula (1).
- R 1 is an alkyl group having 2 to 5 carbon atoms containing an unsaturated bond
- M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group or an organic amine salt.
- the superabsorbent polymer according to the present invention may have a particulate mill having a particle diameter of 150 to 850.
- the superabsorbent polymer according to the present invention may exhibit more improved absorbency and water retention as (meth) acrylic polyalkylene glycol is present on the internally crosslinked crosslinked polymer in the surface crosslinked layer.
- Figure 2 is a graph showing the results of nuclear magnetic resonance measurement for the (meth) acrylated polyalkylene glycol used in one embodiment of the present invention.
- the 'super absorbent polymer' is a synthetic polymer material having a function of absorbing water of about 500 to 1,000 times its own weight.
- the polymer gel is formed by drying and grinding the hydrogel polymer. It may be prepared by a method of crosslinking the surface of the particles.
- Such a super absorbent polymer may have a structure in which a 'surface crosslinked layer' is formed by surface crosslinking on an internal crosslinked 'crosslinked polymer'.
- the fact that a component is present on another component may refer to a case in which all components exist on or in the surface of the other component.
- the fact that a component is 'on the crosslinked polymer' means that it is present on the surface (surface crosslinked layer) of the crosslinked polymer or in the entirety of the internally crosslinked crosslinked polymer in the surface crosslinked layer. It can mean covering everything.
- (meth) acrylated polyalkylene glycol refers to a polyamylene glycol in which an acryl group or a methacryl group is introduced into a molecule through a substitution reaction.
- first component may also be referred to as the second component without departing from the scope, and similarly the second component may also be referred to as the first component.
- water content refers to the content of water based on the total weight of the hydrogel polymer, and can be calculated using the weight of the hydrogel polymer, which is known, minus the weight of the dried polymer.
- the moisture content may be defined as a value calculated by measuring the weight loss due to evaporation of water in the polymer during the process of drying up the temperature of the hydrogel polymer through infrared heating.
- the term 'and / or' means to include a combination of a plurality of related items or any one of a plurality of related items.
- the inventors of the present invention in the course of repeated studies on the super absorbent polymer, when (meth) acrylated polyalkylene glycol is present on the internally crosslinked crosslinked polymer in the surface crosslinked layer of the superabsorbent polymer, preferably (meth) When at least a portion of the acrylated polyalkylene glycol is present in the crosslinked state of the crosslinked polymer, or the surface crosslinked layer, or the crosslinked polymer and the surface crosslinked layer, the present invention was found to exhibit improved absorption rate and absorbency. Was completed. 1.
- a superabsorbent polymer comprising (meth) acrylic polyalkylene glycol present on the crosslinked polymer.
- the crosslinked polymer is a polymerization and crosslinking product of a monomer composition including an acrylic acid monomer, and the surface thereof may be crosslinked to further form a surface crosslinking layer.
- the acrylic acid monomer to be a polymerization raw material of the crosslinked polymer may be represented by the following formula (1):
- R 1 is an alkyl group having 2 to 5 carbon atoms including an unsaturated bond
- M 1 is a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group, or an organic amine salt.
- the acrylic acid monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium salts and organic amine salts of these acids.
- the acrylic acid monomer may have an acidic group, and at least a part of the acidic group may be neutralized.
- the acrylic acid monomer may be partially neutralized with an alkyl material such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, or the like. .
- the degree of neutralization of the acrylic acid monomer may be about 40 to 95 mol 0 /., Preferably about 40 to 80 mol 0 /. The more preferred is about 45 to 75 mol 0 /.
- the range of neutralization degree of the acidic group varies depending on the final physical properties, but if the degree of neutralization is too high, most of the resulting resin can be dissolved in water. It can exhibit the same properties as elastic rubber. Therefore, the neutralization degree of the acidic group is advantageously adjusted to the above-mentioned range.
- the acrylic acid monomer may be provided on the aqueous solution before the polymerization, the monomer concentration in the aqueous solution is about 20 to. 95 parts by weight 0/0, preferably from about 40 to 65 weight 0 /. May be. This is to improve the grinding efficiency during the pulverization of the polymer in the manufacturing process, while eliminating the need for removing the unbanung monomer after polymerization by using the gel effect phenomenon appearing in the polymerization reaction of the high concentration aqueous solution.
- the solvent water may be adjusted in an increase ratio of 1 to 5 times with respect to the content of the acrylic acid monomer, and the amount of the solvent may be determined in consideration of polymerization heat control and the like.
- the superabsorbent polymer according to the present invention the acrylic acid monomer may be polymerized in the presence of a polymerization initiator and (meth) acrylated polyalkylene glycol to be described later.
- the said polymerization initiator is demonstrated in the manufacturing method part of a super absorbent polymer.
- the polymerization of the acrylic acid monomer is required to use a crosslinking agent to maintain the physical properties of the resin to be produced.
- a crosslinking method of the resin there are 'simultaneous crosslinking method' which can introduce crosslinking between polymer chains during polymerization, and 'postcrosslinking method' which causes crosslinking of functional groups of the polymer after polymerization.
- the crosslinking density of the polymer is increased, the absorbency may be reduced.
- the superabsorbent polymer may further have a surface crosslinking layer formed by surface crosslinking the crosslinked polymer internally crosslinked with a first crosslinking agent with a second crosslinking agent.
- the first crosslinking agent is a crosslinking agent capable of simultaneous crosslinking, and any divinyl compound monomer capable of introducing crosslinking during polymerization may be used.
- said 1st crosslinking agent ⁇ , ⁇ '- methylenebisacrylamide, trimethyl propane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol (meth) acrylate, and propylene glycol die ( Meta) acrylate, polypropylene glycol (meth) acrylate, butanediol di (meth) acrylate, butylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, nucleic acid diol di ( Meta) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate,
- any second crosslinking agent used for surface crosslinking of the internally crosslinked crosslinked polymer may be used as long as it is a material capable of introducing a surface crosslinked structure in response to an acid group of the crosslinked polymer.
- a second crosslinking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol polyglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, Ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, tetraethylene glycol, propane diol, dipropylene glycol, polypropylene glycol, glycerin, polyglycerol, butanediol, heptanediol, nucleic acid diol trimethyl propane, penta Glycidyl ether-based or polyhydric alcohol-based compounds such as calcium hydroxide, magnesium hydrox
- the content of the first crosslinking agent is preferably 0.01 to 2 parts by weight based on 100 parts by weight of the acrylic monomer. That is, when the content of the first crosslinking agent is less than 0.01 parts by weight based on 100 parts by weight of the acrylic acid monomer, the absorption rate and gel strength of the final superabsorbent water may be weakened. In addition, when the content of the first crosslinking agent exceeds 2 parts by weight with respect to 100 parts by weight of the acrylic acid monomer, the absorbency of the superabsorbent polymer may be lowered, which may be undesirable as an absorbent.
- the content of the second crosslinking agent is preferably 0.001 to 5 parts by weight based on 100 parts by weight of the crosslinked polymer. That is, when the content of the second crosslinking agent is too low, the surface crosslinking structure may not be properly introduced and the absorption force or the absorption rate of the superabsorbent polymer may be insufficient. On the contrary, when the content of the second crosslinking agent is higher than necessary, the absorbency of the resin may be lowered due to excessive surface crosslinking reaction.
- the first cross-linking agent and the agent The relative amount of crosslinking agent used may depend on the chain length and type of crosslinking agent.
- the superabsorbent resin includes (meth) acrylated poly alkylene glycol present on the crosslinked polymer.
- the dispersibility of the monomer composition including an acrylic acid monomer, a polymerization initiator, a crosslinking agent, and the like can be further improved, which is a function of the finally obtained resin. It has been found that it can be linked to improved physical properties such as absorbency.
- Such (meth) acrylated polyalkylene glycols may be used in the formation of the crosslinked polymer, and may be present throughout the internally crosslinked crosslinked polymer in the surface crosslinked layer.
- the (meth) acrylated polyalkylene glycol may be used in the surface crosslinking process of the crosslinked polymer and present on the surface crosslinked layer.
- the (meth) acrylated poly alkylene glycol may be used both in the formation process of the crosslinked polymer and in the surface crosslinking process thereof, and may exist simultaneously on the crosslinked polymer and the surface crosslinked layer.
- the (meth) acrylated polyalkylene glycol may be present in a state in which at least a portion thereof is crosslinked with the crosslinked polymer and / or the surface crosslinked layer.
- the (meth) acrylated poly alkylene glycol is a poly alkylene glycol
- the (meth) acrylic substitution reaction reaction it may be a mono substituent, a di substituent, or a combination thereof.
- the (meth) acrylate of polyalkylene glycol (meth) acrylated poly ethylene glycol, (meth) acrylated polypropylene glycol and (meth) acrylated polybutylene be one kinds or more, selected from the group consisting of glycol, and the Among them, (meth) acrylic polyetherelin glycol is more preferable in that it is advantageous to produce in a commercial process.
- the effect of the addition of the (meth) acrylated polyalkylene glycol may appear to an effective degree irrespective of the molecular weight of the (meth) acrylated poly alkylene glycol. Therefore, the (meth) acrylated The molecular weight of the polyalkylene glycol is not particularly limited.
- the weight average molecular weight of the (meth) acrylated polyalkylene glycol is greater than 50,000, solubility in the monomer composition may be decreased, and thus uniform crosslinking reaction may be inhibited and the physical properties of the final resin may be reduced.
- the superabsorbent polymer of one embodiment obtained as described above has improved absorbency under pressure and improved pressure absorption with the use of suitable first and second crosslinking agents, the introduction of crosslinking structures and the use of specific (meth) acrylic polyalkylene glycols. Can be represented.
- Such superabsorbent polymers may be particles having a particle diameter of about 150 to 850, and may be prepared by additionally performing a proper grinding and / or classification process before or after surface crosslinking.
- Polymerizing a monomer composition comprising an acrylic acid monomer having an acidic group and neutralizing a portion of the acidic group in the presence of a polymerization initiator, a first crosslinking agent and a (meth) acrylated polyalkylene glycol to form a ' hydrogel polymer ' ;
- a method for producing a super absorbent polymer including a.
- the step of polymerizing and crosslinking a monomer composition comprising an acrylic acid monomer in the presence of a polymerization initiator, a first crosslinking agent and a (meth) acrylated polyalkylene glycol may be performed to form a hydrogel polymer.
- the monomer composition may include an acrylic acid monomer, a solvent, a polymerization initiator, and a first crosslinking agent.
- the monomer composition may further include (meth) acrylated polyalkylene glycol.
- the acrylic acid monomer included in the monomer composition may be represented by Formula 1 below:
- R 1 is an alkyl group having 2 to 5 carbon atoms including an unsaturated bond
- M 1 is a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group, or an organic amine salt.
- the acrylic acid monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium salts and organic amine salts of these acids.
- acrylic acid or its salt is used as the acrylic acid monomer as described above, it is advantageous to obtain a super absorbent polymer having improved water absorption.
- the acrylic acid monomer may have an acidic group, and at least a part of the acidic group may be neutralized.
- the acrylic acid monomer may be partially enriched with an alkyl material such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, or the like.
- the degree of saturation of the acrylic acid monomer may be about 40 to 95 mol 0 /., Preferably about 40 to 80 mol 0 /., More preferably about 45 to 75 mol 0 /.
- the range of the degree of neutralization varies depending on the final physical properties. However, if the degree of neutralization is too high, most of the obtained polymer is dissolved in water. When too low, the absorbency of the polymer not only decreases significantly but also exhibits properties such as elastic rubber, which is difficult to handle.
- the concentration of the monomer composition of acrylic acid monomer is the polymerization time and the reaction may be appropriately adjusted in consideration of the conditions, preferably from about 20 to 95 weight 0/0, more preferably from about 40 to 65 weight 0 / It can be zero . This is to control the grinding efficiency during the pulverization of the polymer to be described later, while eliminating the need to remove the unbanung monomer after the polymerization by using the gel effect phenomenon appearing in the polymerization reaction of the high concentration aqueous solution.
- the monomer composition includes a polymerization initiator for polymerization of the acrylic acid monomer
- the polymerization initiator may be used a thermal polymerization initiator or a photopolymerization initiator and the like depending on the polymerization method.
- a thermal polymerization initiator is additionally used. May be included.
- the thermal polymerization initiator one or more selected from the group consisting of persulfate initiator, azo initiator, hydrogen peroxide, and ascorbic acid may be used.
- the persulfate-based initiator and sodium sulfate sodium persulfate; Na 2 S 2 O8
- potassium persulfate Pot persulfate
- ammonium persulfate Ammonium persulfate; (NH 4) 2 S 2 O 8
- azo (Azo) -based initiators are 2,2-azobis- (2-amidinopropane) dihydrochloride (2,2-azobis (2-amidinopropane) dihydrochloride), 2,2-azobis- ( N, N-dimethylene) isobutyramidine dihydrochloride (2,2-azobis- (N, N-dimethylene) isobutyramidine dihydrochloride), 2-
- the photopolymerization initiator may be benzoin ether, dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl dimethyl ketal. Ketal), acyl phosphine and one or more selected from the group consisting of alpha -aminoketone can be used.
- acylphosphine commercially available lucirin TPO, that is, 2,4,6-trimethyl- benzoyl-trimethyl phosphine oxide (2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide) can be used. Can be. More various photoinitiators are described in Reinhold Schwalm's book “UV Coatings: Basics, Recent Developments and New Application (Sevier 2007)" on page 115, without being limited to the examples described above.
- the amount of the polymerization initiator used is preferably 0 to 01 to 2.0 parts by weight based on 100 parts by weight of the acrylic monomer.
- the content of the polymerization initiator is less than 0.001 parts by weight, the conversion rate is low, so that the remaining monomers may be extracted in the final product in a large amount. It is not preferable because the final physical properties may be lowered such as higher and lower the pressure absorption capacity.
- the monomer composition includes a crosslinking agent for maintaining the physical properties of the resin by the polymerization of the acrylic acid monomer.
- the crosslinking agent is a first crosslinking agent (internal crosslinking agent) for internal crosslinking of the hydrogel polymer, and is used separately from a second crosslinking agent (surface crosslinking agent) for crosslinking the surface of the hydrogel polymer. Specific types and contents of the first crosslinking agent and the second crosslinking agent are replaced with the above contents.
- the step of forming the hydrogel polymer may be carried out in the presence of (meth) acrylated polyalkylene glycol. That is, (meth) acrylated polyalkylene glycol may be added to the monomer composition.
- the dispersibility of the monomer composition including the acrylic acid monomer, the polymerization initiator, the first crosslinking agent, and the like may be further improved, and thus the polymerization and crosslinking of the resulting polymer may be more improved. It can be made uniform, it was found that this can be linked to the improvement of physical properties, such as absorbency of the finally obtained resin.
- the (meth) acrylic polyalkylene glycol may be obtained through polyalkylene glycol through a (meth) acrylic substitution reaction, and the acryl substitution reaction of the polyalkylene glycol is conventional in the art to which the present invention pertains. Since it can be carried out by the method, it is not particularly limited. And the specific kind, molecular weight, and its content of the said (meth) acrylated polyalkylene glycol are replaced by the above-mentioned content.
- the method of polymerizing and crosslinking the monomer composition as described above to form a hydrogel polymer may be applied without limitation in the configuration as long as it is a conventional polymerization method in the art.
- the polymerization method is largely divided into thermal polymerization and photopolymerization according to the type of polymerization energy source.
- the thermal polymerization is performed, the polymerization method may be performed in a reaction vessel having a stirring shaft such as a kneader, and photopolymerization.
- the polymerization method may be performed in a reaction vessel having a stirring shaft such as a kneader, and photopolymerization.
- the polymerization method may be performed in a reaction vessel having a stirring shaft such as a kneader, and photopolymerization.
- the hydrogel polymer may be obtained by adding the monomer composition to a reaction vessel such as a kneader equipped with a stirring shaft, and supplying hot air thereto or heating and heating the reaction vessel.
- a reaction vessel such as a kneader equipped with a stirring shaft
- the hydrous gel polymer discharged to the outlet of the counterunggi according to the shape of the stirring shaft provided in the counterunggi may be obtained from particles of several millimeters to several centimeters.
- the resulting hydrogel polymer may be prepared by the concentration of the monomer composition to be injected and It can be obtained in various forms depending on the injection rate, etc., a hydrogel polymer having a (weight) particle diameter of usually 2 to 50 mm can be obtained.
- a sheet-like hydrogel polymer (hereinafter referred to as a polymer sheet) may be obtained when photopolymerization of the monomer composition is carried out in a reaction vessel equipped with a movable conveyor belt.
- the thickness of the polymer sheet may vary depending on the concentration and the injection speed of the monomer composition to be injected.
- a polymer having a thickness of 0.5 to 5 cm is usually used. It is desirable to adjust to obtain a sheet.
- the forming the gel polymer is a function of the water content of the polymer formed can be carried out so that 40 to 80 wt. 0/0. It is preferable that the water content of the polymer thus formed is in the above range in that it optimizes the efficiency in the drying step described later. (Drying the hydrogel polymer)
- the step of drying the hydrogel polymer may be performed.
- the step of grinding the hydrogel polymer before drying may be further roughened.
- the pulverizer that can be used at this time is not particularly limited, but a vertical pulverizer, a turbo cutter, a turbo grinder, a rotary cutter mill, a cutting machine Examples include a cutter mill, a disc mill, a shred crusher, a crusher, a chopper, a disc cutter, and the like.
- the milling step may include steam, water, surfactant, fine powder anti-skid agent such as Clay or Silica; Persulfate initiators, azo initiators, hydrogen peroxide, and A crosslinking agent such as a thermal polymerization initiator such as ascorbic acid, an epoxy crosslinking agent, a diol crosslinking agent, a crosslinking agent containing a bifunctional or trifunctional or higher polyfunctional acrylate, a crosslinking agent such as a compound of a monofunctional group containing a hydroxyl group, and the like may be added.
- a crosslinking agent such as a thermal polymerization initiator such as ascorbic acid, an epoxy crosslinking agent, a diol crosslinking agent, a crosslinking agent containing a bifunctional or trifunctional or higher polyfunctional acrylate, a crosslinking agent such as a compound of a monofunctional group containing a hydroxyl group, and the like may be added.
- This grinding step may be performed so that the particle diameter of the hydrogel polymer is 2 to 10 mm. That is, it is preferable to grind the hydrogel polymer into particles having a particle diameter of 10 mm or less so that the efficiency increase effect can be seen in the subsequent drying step, and coarse grains may occur when excessive grinding is performed. Pulverization into particles is preferred.
- the drying step may be carried out under a temperature of 150 to 250 ° C, preferably 160 to 200 ° C.
- the drying temperature may be defined as the temperature of the heating medium supplied for drying or the temperature of the drying reaction including the heating medium and the polymer in the drying process.). That is, when the drying temperature is low due to a low drying temperature, the physical properties of the final superabsorbent polymer may be lowered. In order to prevent this, the drying temperature is preferably 150 ° C. or higher.
- the drying temperature when the drying temperature is higher than necessary, only the surface of the hydrous gel phase polymer may be dried to increase the generation of fine powder in the pulverization process described later, and the physical properties of the final superabsorbent polymer may be lowered. It is preferable that it is 250 ° C or less.
- the drying time of the drying step is not particularly limited, but may be performed for 20 to 90 minutes under the drying temperature in consideration of process efficiency and the like.
- the drying method of the drying step can also be commonly used as a drying process of the hydrous gel phase polymer is applicable to the configuration without limitation.
- the drying step may be a method such as hot air supply, infrared irradiation, microwave irradiation, or ultraviolet irradiation.
- This drying step can be carried out so that the water content of the dried polymer is 0.5 to 10% by weight. That is, the water content of the polymer 0.5 0/0 of less than W
- the step of grinding the dried hydrogel polymer may be performed.
- the pulverizing may be performed to optimize the surface area of the dried hydrogel polymer, and may be performed to have a particle diameter of 150 to 850.
- the construction is not specifically limited as a grinder which can be used at this time, A pin mill, a hammer mill, a screw mill, a mill, a disc mill And a jog mill etc. are mentioned, for example.
- the pulverization step as the pulverized hydrogel polymer formed and dried according to an embodiment of the present invention, the amount of fines generated in the pulverization process may be adjusted to less than 5% of the weight of the polymer before pulverization.
- the step of classifying the polymer powder obtained through the above process into a polymer having a particle size of 150 to 850 may be further performed. This is a step that can be further performed to manage the physical properties of the superabsorbent polymer powder to be finalized, it can be used to classify the polymer having the above particle size.
- a step of performing a surface crosslinking reaction of the pulverized polymer in the presence of a second crosslinking agent may be performed.
- the step is to improve the physical properties of the super absorbent polymer by crosslinking the surface of the dried and pulverized polymer as described above.
- the step is to improve the physical properties of the super absorbent polymer by crosslinking the surface of the dried and pulverized polymer as described above.
- a surface crosslinking layer can be formed.
- the second crosslinking agent any compound capable of reacting with the functional group of the polymer may be used without being limited to the constitution.
- the method of mixing the second crosslinking agent and the pulverized polymer in a semi-permanent mixture a method of spraying a second crosslinking agent to the pulverized polymer, The method of supplying and mixing a 2nd crosslinking agent continuously, etc. can be used.
- water may be additionally added when the second crosslinking agent is added.
- the surface crosslinking reaction step may be performed under a temperature of 100 to 250 ° C, may be continuously performed after the drying and grinding step proceeds to a relatively high temperature, and may be performed in the temperature range for shortening the process time Can be. At this time .
- the surface crosslinking reaction may be performed for 1 to 120 minutes, preferably 1 to 100 minutes, more preferably 10 to 60 minutes. In other words, in order to induce a minimum surface crosslinking reaction and to prevent excessive reactions of the polymer particles from being damaged and the physical properties thereof from being lowered, the above-described surface crosslinking reaction may be performed.
- amine salt was removed by filtration using the Buchner funnel, and acrylated polyethylene glycol was saliva exhibited using 2 L of nucleic acid.
- the precipitated acrylated polyethylene glycol was filtered and then dried in a vacuum oven at about 40 ° C. for about 12 hours.
- An acrylated polyethylene glycol was obtained under the same conditions and methods as in Preparation Example 1, except that polyethylene glycol having a weight average molecular weight of 4,500 was used instead of polyethylene glycol having a weight average molecular weight of 20,000.
- An acrylated polyethylene glycol was obtained under the same conditions and methods as in Production Example 1 except that polyethylene glycol having a weight average molecular weight of 600 was used instead of polyethylene glycol having a weight average molecular weight of 20,000.
- a water-soluble unsaturated monomer aqueous solution was prepared by adding about 1.0 g of ⁇ , ⁇ '-methylenebisacrylamide as an internal crosslinking agent (first crosslinking agent) to about 500 g of acrylic acid, followed by mixing. Degree of neutralization of the acrylic acid monomer: 70 mol 0 /.
- the aqueous water-soluble unsaturated monomer aqueous solution was supplied to a 5 L two-way kneader having a sigma-shaped shaft, and nitrogen gas was added for 30 minutes while maintaining the temperature at 40 ° C. to remove oxygen dissolved in the aqueous solution. While progress stirring 0.2 0 /.
- L- ascorbic acid and about 50.1g sodium persulfate solution and about 50.5g Z0 weight 0/0 aqueous hydrogen peroxide solution according to the acrylated polyethylene glycol of about 3g and about 51.0g Preparative Example 1 Added.
- the polymerization was started after 20 seconds and the resulting gel was finely divided for 30 minutes using shear force.
- the finely divided gel was spread out about 30 mm thick on a stainless wire gauze having a pore size of 600 mm 3 and dried in a 140 ° C. hot air oven for 5 hours.
- the dry polymer thus obtained was pulverized using a pulverizer and classified into a standard mesh of ASTM specification to obtain a crosslinked polymer which is an absorbent resin powder having a particle size of 150zm to 850m.
- Ethylene glycol diglycidyl ether in the resulting crosslinked polymer I00g (second cross-linking agent; surface cross-linking agent) 0.3g, and 3.0g of methanol were then combined common evenly while applying a common hapaek of water 3.0g 140 ° C 30 minutes in a hot air oven dried .
- the dried powder was classified into a standard mesh of ASTM specification to obtain a crosslinked polymer, which is an absorbent resin powder having a particle size of 150 kPa to 850 m.
- Example 2 A crosslinked polymer was obtained under the same conditions and methods as in Example 1, except that the same amount of acrylated polyethylene glycol according to Preparation Example 2 was added instead of the acrylated polyethylene glycol according to Preparation Example 1.
- a crosslinked polymer was obtained under the same conditions and methods as in Example 1 except that the same amount of acrylated polyethylene glycol according to Preparation Example 3 was added instead of the acrylated polyethylene glycol according to Preparation Example 1.
- a crosslinked polymer was obtained under the same conditions and methods as in Example 1 except that the same amount of methacrylated polyethylene glycol according to Preparation Example 4 was added.
- Example 1 Except for not adding the acrylated polyethylene glycol according to Preparation Example 1 in Example 1, a crosslinked polymer was obtained under the same conditions and methods as in Example 1.
- a crosslinked polymer was obtained under the same conditions and methods as in Example 1 except that the same amount of polyethylene glycol having an unacrylated weight average molecular weight of 20,000 was added instead of the acrylated polyethylene glycol according to Preparation Example 1.
- a crosslinked polymer was obtained under the same conditions and methods as in Example 1 except for the same amount of polyethylene glycol having a weight average molecular weight of 600 which was not acrylated instead of acrylated polyethylene glycol according to Preparation Example 1.
- Experimental Example 1 A crosslinked polymer was obtained under the same conditions and methods as in Example 1 except for the same amount of polyethylene glycol having a weight average molecular weight of 600 which was not acrylated instead of acrylated polyethylene glycol according to Preparation Example 1.
- the water-absorbent resins of the above examples and comparative examples were measured for centrifugal water-retaining capacity (CRC) based on the absorptive absorptivity.
- CRC centrifugal water-retaining capacity
- Resin W (g) (about 0.2g) put into the bag evenly on the seal of the non-woven fabric obtained in vigorously at room temperature impregnated with physiological saline (0.9 weight 0/0). After about 30 minutes had evaporated from the bag for 3 minutes under the conditions of 250G using a centrifuge, and the mass W2 (g) of the bag was measured. Moreover, mass W1 (g) at that time was measured after performing the same operation without using resin. Using each mass obtained, CRC (g / g) was computed according to the following formula.
- W is the weight of absorbent resin.
- W1 is the weight measured after impregnating a nonwoven fabric bag without absorbent resin in saline solution at room temperature for 30 minutes and dehydrating it at 250G for 3 minutes using a centrifuge.
- W2 is the weight measured after impregnating nonwoven fabric bag with absorbent resin in saline solution for 30 minutes and dehydrating it at 250G for 3 minutes using centrifuge.
- a portion was taken and passed through a filter of 0.45 pore size, and then analyzed by HPLC by taking about 10-100 ⁇ A. Residual acrylic acid monomer and its content are determined based on the calibration curve for each concentration.
- a stainless steel mesh 400 mesh was mounted on the bottom of a 60 mm plastic cylinder.
- the piston which is able to evenly spread about 0.90 g of absorbent resin on the wire mesh under the conditions of normal temperature and 50% humidity, has a load of 4.83 kPa (0.7 psi) evenly and is slightly smaller than the outer diameter of 60 mm and There is no gap with the inner wall and the up and down movement is not disturbed. At this time, the weight Wa (g) of the apparatus was measured.
- a 90 mm diameter and 5 mm thick glass filter was placed inside a 150 mm diameter petri dish, and the physiological saline consisting of 0.90 weight 0 / ° sodium chloride was brought to the same level as the top surface of the glass filter. It was loaded with a 90mm diameter filter paper. The measuring device was placed on the filter paper and the liquid was absorbed for 1 hour under load. After 1 hour, the measuring device was lifted up and the weight Wb (g) was measured.
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- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (4)
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US14/401,079 US9114381B2 (en) | 2012-11-15 | 2013-10-14 | Super absorbent polymer |
JP2015542942A JP2015536375A (ja) | 2012-11-15 | 2013-10-14 | 高吸水性樹脂 |
CN201380040020.5A CN104854147A (zh) | 2012-11-15 | 2013-10-14 | 高吸水性聚合物 |
EP13855833.3A EP2837641A4 (en) | 2012-11-15 | 2013-10-14 | SUPERABSORBENT POLYMER |
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KR10-2012-0129558 | 2012-11-15 | ||
KR20120129558 | 2012-11-15 | ||
KR10-2013-0121967 | 2013-10-14 | ||
KR1020130121967A KR20140063400A (ko) | 2012-11-15 | 2013-10-14 | 고흡수성 수지 |
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US (1) | US9114381B2 (ko) |
EP (1) | EP2837641A4 (ko) |
JP (1) | JP2015536375A (ko) |
KR (2) | KR20140063400A (ko) |
CN (1) | CN104854147A (ko) |
WO (1) | WO2014077517A1 (ko) |
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US9486778B2 (en) * | 2013-09-30 | 2016-11-08 | Lg Chem, Ltd. | Super absorbent polymer and preparation method thereof |
US10285866B2 (en) | 2015-01-16 | 2019-05-14 | Lg Chem, Ltd. | Super absorbent polymer |
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KR101595037B1 (ko) * | 2013-01-15 | 2016-02-17 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
KR101684649B1 (ko) * | 2014-06-13 | 2016-12-08 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 및 이를 통해 제조된 고흡수성 수지 |
KR102011926B1 (ko) | 2014-12-22 | 2019-08-20 | 주식회사 엘지화학 | 고흡수성 수지 및 이의 제조 방법 |
WO2016104962A1 (ko) * | 2014-12-22 | 2016-06-30 | 주식회사 엘지화학 | 고흡수성 수지 및 이의 제조 방법 |
KR102242700B1 (ko) * | 2016-04-20 | 2021-04-21 | 한화솔루션 주식회사 | 고흡수성 수지 및 이의 제조 방법 |
KR102093352B1 (ko) * | 2016-12-19 | 2020-03-25 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
US11926939B2 (en) | 2017-10-30 | 2024-03-12 | Lg Chem, Ltd. | Super absorbent polymer non-woven fabric and preparation method of the same |
KR102364365B1 (ko) * | 2017-12-08 | 2022-02-17 | 주식회사 엘지화학 | 신규한 가교제 화합물 및 이를 이용하여 제조되는 중합체 |
KR102565748B1 (ko) | 2017-12-11 | 2023-08-11 | 주식회사 엘지화학 | 고흡수성 수지 및 이의 제조 방법 |
WO2019160883A1 (en) * | 2018-02-13 | 2019-08-22 | Cool Vapor Solutions | Methods and compositions for humidification and cooling of gas streams |
EP4040151A4 (en) | 2019-09-30 | 2023-02-15 | FUJIFILM Corporation | IMMUNOLOGICAL TEST METHOD AND CONDENSATION TEMPLATE |
EP4099017A4 (en) | 2020-01-31 | 2023-02-15 | FUJIFILM Corporation | IMMUNOLOGICAL TEST METHOD |
TR2022012019A2 (tr) * | 2022-07-28 | 2022-08-22 | Karadeniz Teknik Ueniversitesi Teknoloji Transfer Arastirma Ve Uygulama Merkezi | Süperabsorbent poli̇mer |
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- 2013-10-14 KR KR1020130121967A patent/KR20140063400A/ko active Application Filing
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Also Published As
Publication number | Publication date |
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JP2015536375A (ja) | 2015-12-21 |
EP2837641A1 (en) | 2015-02-18 |
CN104854147A (zh) | 2015-08-19 |
KR20150132817A (ko) | 2015-11-26 |
KR20140063400A (ko) | 2014-05-27 |
EP2837641A4 (en) | 2015-10-07 |
US20150099624A1 (en) | 2015-04-09 |
US9114381B2 (en) | 2015-08-25 |
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